Revolving and sifting grate



E. B. McHUGHES.

Grate.

N0. 312. I Patented July 29, 1837.

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u. PETERS. Fhnlmllllwgraphar. Washi c.

' iii REVOLVING AND S'IFTING GR-ATE.

Specification of Letters Patent No. 312, dated July 29, 1837.

To all whom it may concern Be it known that I, ENOS B. M. HUGHES, of NewHaven, in the county of New Haven, State of Connecticut, have invented anew and useful Improvement in Grates for Burning Hard Coal, called theRevolving and Sift-ing Grate; and I do hereby declare that the followingis a full and exact description thereof.

The nature and character of my invention consists in constructing agrate for hard coal with non conducting ends, and open bars on allsides, which is suspended by journals or gudgeons, and confines theburning coals while the whole revolves or turns and sifts out the ashesand other incombustible matter which can pass between the bars.

To enable others skilled in the business of casting or manufacturinggrates to make and use my invention, I proceed to describe itsconstruction and operation.

Each end is formed of two cast iron plates about one quarter of an inchthick the inner and larger of which, corresponding in size with the bodyof the grate, has an opening a little less than the inner section of thegrate, which opening is surrounded with a projection or flange extendingone inch and one quarter outward, which flange is set one quarter of aninch from the edge of the opening in the plate. The outer and smallerplate is of the thickness of the inner plate, corresponds in size withthe flange to which it is fitted and fastened, and the gudgeon formed inthe usual way and on which the whole turns, projects from this Plate.

A fire brick two inches thick is made to fit the opening in the innerplate, and proj ect half an inch inside thereof, with a shoulder fittingin and filling up the opening made by the flange and which is thuscovered externally and held firm by the outer plate. If the inner platewas cast with a flange and no opening the two plates would form an airchamber, which would be a partial substitute for the fire brick. Thusthe non conducting ends of the grate are completed.

The sides of the grate I make with three sets of bars. The front set maybe made in the usual way. The only caution to be used is to place thebars at such distances, and make them of such shape as shall bestpromote combustion, radiation of heat, and sifting the coal. I place thefront bars about 1% of an inch apart, makethem about of an inch thick inthe middle, and of an inch wide and bring them nearly to an edge on bothsides.

The top set of bars are cast together in the usual way and are 8/16 ofan inch thick on the inside and on the outside, connecting with a bar infront and rear and forming a door turning on the ends of the rear crossbar which project into the inner plate. The door shuts upon a rodconnecting the inner plates, or any other supporter, and has a smallbutton in front to fasten it when closed The rear bars are castseparately and oined together by two rods of inch in diameter passingthrough an orifice near the ends of the bar. These bars are of thethickness of the front bars, and of such a shape as to fill up theremainder of the space not occupied by the front and top bars andcomplete the grate. These bars are kept" at proper distances and arekept steady in" their places by casting projeotionson them when theorifices are made for rods. The two ends of the grate are made fast tothe bars or rods by uniting them with the inner plates in the usual way.

This grate may be used in a fire place, open stove, or stove constructedto receive it, but in every case must be suspended 'so as to revolve orturn freely on proper supporters, and when revolving a blower or othermeans of inclosing will be useful to prevent dust escaping into theroom. And if so placed that the back bars rest against the back of thefire place, &c., then it will be necessary to make it of a circularform, or to provide that it may be first brought forward until it willhave room to revolve freely. Any convenient mode of suspending orsupporting the grate can be adopted which will give the opportunity torevolve, and it may be made to revolve by a crank or in anyotherconvenient way.

The shape of the whole grate, the size and shape of the bars, I do notdeem essential. The grate would be well proportioned with the sizesabove mentioned, if made 14 inches long and 10 inches deep In theannexed drawing Figure Ishows a front perspective view of the instrumentwith the door or top open. Fig. II. exhibits a fire brick. Fig. III. aback bar.

What I claim as my invention and desire to secure by Letters Patent is Arevolving grate, with non conducting a revolving motion, as described inthe foreends, and all sides formed with open bars, going specification.10

which grate confines the burning coal and Dated the thirty first day ofMarch A. D. 1

sifts and cleanses it from ashes and other 1837.

5 small incombustible particles, and I claim ENOS B. M. HUGHES.

only what is necessary to the construction Witnesses:

of a grate which comblnes, non conducting SAMUEL J. HrrcHoooK,

ends, all its sides formed with open bars, and F. CROsWELL.

